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  <a href="#" class="btn">Lightness: </a><br>
  <a href="#" class="btn">Lightness: </a><br>
  <a href="#" class="btn">Lightness: </a>
              $white: #FDFDFD;
$black: #121212;

$col_1: #F0C0DF;
$col_2: #18C7B2;
$col_3: #47075E;

$value_1: lightness($col_1);
$value_2: lightness($col_2);
$value_3: lightness($col_3);

@function set-button-color($color) {
  @if (lightness($color) > 50) {
    @return black;
  } @else {
    @return white;

@function set-button-shadow($c){
  @if (lightness($c) >= 70) {
    @return 8%;
  @if (lightness($c) <= 69){
    @return 14%
  @if (lightness($c) <= 30) {
    @return 27%;

@mixin button($c){
    margin-top: 10px;
    margin-right: 10px;
    padding: 14px 26px;
    font-size: 1em;
    color: set-button-color($c);
    vertical-align: middle;
    text-align: center;
    cursor: pointer;
    transition: background 0.1s ease-in-out;
    border-radius: 3px;
    outline: 0 none;
    border: 0px solid none;
    background-color: $c;
    box-shadow: 0px 6px 0px 0px darken($c, set-button-shadow($c));
        background-color: saturate($c, 20%);
        margin-top: 18px;
        outline: 0 none;
        box-shadow: 0px 1px 0px 0px darken($c, 25%);

  background: $white;
    family: Roboto;
    weight: 400;
    size: 20px;
  text-transform: uppercase;

  width: 70%;
  text-align: center;
  top: 50%;
  left: 50%;
  position: absolute;
  transform: translate(-50%, -50%);

  text-decoration: none;

  @include button($col_1);
      content: quote(#{$value_1});

  @include button($col_2);
      content: quote(#{$value_2});
  @include button($col_3);
      content: quote(#{$value_3});

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